linux-kernel - [RFC PATCH 08/20] famfs: Add famfs

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Date: Fri, 23 Feb 2024 11:41:52 -0600
From: John Groves <John@...ves.net>
To: John Groves <jgroves@...ron.com>,
	Jonathan Corbet <corbet@....net>,
	Dan Williams <dan.j.williams@...el.com>,
	Vishal Verma <vishal.l.verma@...el.com>,
	Dave Jiang <dave.jiang@...el.com>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Matthew Wilcox <willy@...radead.org>,
	linux-cxl@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	nvdimm@...ts.linux.dev
Cc: John@...ves.net,
	john@...alactic.com,
	Dave Chinner <david@...morbit.com>,
	Christoph Hellwig <hch@...radead.org>,
	dave.hansen@...ux.intel.com,
	gregory.price@...verge.com,
	John Groves <john@...ves.net>
Subject: [RFC PATCH 08/20] famfs: Add famfs_internal.h

Add the famfs_internal.h include file. This contains internal data
structures such as the per-file metadata structure (famfs_file_meta)
and extent formats.

Signed-off-by: John Groves <john@...ves.net>
---
 fs/famfs/famfs_internal.h | 53 +++++++++++++++++++++++++++++++++++++++
 1 file changed, 53 insertions(+)
 create mode 100644 fs/famfs/famfs_internal.h

diff --git a/fs/famfs/famfs_internal.h b/fs/famfs/famfs_internal.h
new file mode 100644
index 000000000000..af3990d43305
--- /dev/null
+++ b/fs/famfs/famfs_internal.h
@@ -0,0 +1,53 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * famfs - dax file system for shared fabric-attached memory
+ *
+ * Copyright 2023-2024 Micron Technology, Inc.
+ *
+ * This file system, originally based on ramfs the dax support from xfs,
+ * is intended to allow multiple host systems to mount a common file system
+ * view of dax files that map to shared memory.
+ */
+#ifndef FAMFS_INTERNAL_H
+#define FAMFS_INTERNAL_H
+
+#include <linux/atomic.h>
+#include <linux/famfs_ioctl.h>
+
+#define FAMFS_MAGIC 0x87b282ff
+
+#define FAMFS_BLKDEV_MODE (FMODE_READ|FMODE_WRITE)
+
+extern const struct file_operations      famfs_file_operations;
+
+/*
+ * Each famfs dax file has this hanging from its inode->i_private.
+ */
+struct famfs_file_meta {
+	int                   error;
+	enum famfs_file_type  file_type;
+	size_t                file_size;
+	enum extent_type      tfs_extent_type;
+	size_t                tfs_extent_ct;
+	struct famfs_extent   tfs_extents[];  /* flexible array */
+};
+
+struct famfs_mount_opts {
+	umode_t mode;
+};
+
+extern const struct iomap_ops             famfs_iomap_ops;
+extern const struct vm_operations_struct  famfs_file_vm_ops;
+
+#define ROOTDEV_STRLEN 80
+
+struct famfs_fs_info {
+	struct famfs_mount_opts  mount_opts;
+	struct file             *dax_filp;
+	struct dax_device       *dax_devp;
+	struct bdev_handle      *bdev_handle;
+	struct list_head         fsi_list;
+	char                    *rootdev;
+};
+
+#endif /* FAMFS_INTERNAL_H */
-- 
2.43.0